A B-type natriuretic peptide (BNP) of less than 10 pg/ml is normal because the biological reference interval for BNP is <100 pg/ml, so a BNP test of less than 10 pg/ml indicates that the result is within the normal range. BNP is commonly used as one of the laboratory indicators for the diagnosis of cardiovascular diseases, because BNP is a cardiac endocrine hormone, and when myocardial injury increases the load on the left ventricle and/or the tension in the wall of the ventricle, resulting in an increase in the synthesis, secretion, and release of BNP, and an increase in the level of BNP in the blood serum. Therefore, abnormal BNP levels often reflect the presence of heart failure, myocardial infarction, renal insufficiency and other diseases. If the BNP level is elevated, it is recommended to review the cardiac ultrasound and other laboratory tests for a comprehensive diagnosis of the disease, and to cooperate with the doctor for active and effective treatment.